COMPLETE OVERHAUL OF PISTOL

9. If a pistol does not operate properly after the above operations have been completed, it will be nesessary to overhaul the pistol completely. To do this first disassemble the fi-ring plunger assembly as directed above. Then set the index pointer at 30 foot mark and proceed as follows:

(a) Melt solder lock on index pointer screws and inlet valve body of Mark 6 pistol and re-move inlet valve. Take off index pointer and index pointer carrier. Separate these two parts as noted in paragraph 6 (f).

DEEP FIRING MECHANISM Mk 6 MOD. 1

(b) Melt solder lock on index pointer screws and deep firing mechanism body of Mark 6 Mod. 1 pistols which have this construction. Remove deep firing mechanism, index pointer and index pointer carrier. Separate the latter two parts as noted in paragraph 6 (f).

SET SCREWS AND LOCK WASHERS Mk 6 MOD. 1

(c) Remove self locking cup point set screws in index pointer, and deep firing mechanism body flange and re-move round head brass screws in arcuate slots of index pointer. Unscrew deep firing mechanism and take off in-dex pointer and index pointer carrier. This instruction applies to Mark 6 Mod. 1 pistol which have set screw locking feature.

(d) Unscrew dial plate lock ring. Graps the neck of the depth setting sleeve and raise the sleeve. This will move the dial plate off the lock pin in the carrying flange. Then remove the sleeve by turning it counterclockwise. The dial plate will come off with the sleeve.

(f) If spring engaging collar is locking in place with sol-der, melt the solder. Optional practice permits staking to lock this part. Unscrew the collar with wrench provided. If collar is staked extra torque applied to the wrench handle will be sufficient to break the collar free. Remove the depth setting spring and adjusting bushing.

(g) The inlet valve assembly of Mark 6 pistol may be broken down by removing the stop (with wrench provi-ded), the inlet valve, and valve spring.

(h) The disassembly of deep firing mechanism of Mark 6 Mod. 1 pistol is performed as follows:

(1) Submerge assembly in water up to a point just be-low the end surface of the spring adjusting screw and use a small torch to melt solder lock on adjusting screw. The water is used to dissipate heat which would have a harmful effect on the gland seal and spring.

(2) While solder is molten remove spring adjusting screw with screw driver.

(3) Remove spring and valve stem with attached ball valve.

(4) Take out screws and remove dial plate. It will be necessary to separate dial plate from housing by use of a knife or other sharp bladed tool because shellac has been used to seal paper gasket.

(5) Remove packing nut with packing nut and gland wrench.

(6) Remove valve seat with screw driver.

(7) Remove gland seal.

NOTE: Whenever a deep firing valve is broken down a new dial plate (paper) gasket and gland seal must be installed upon reassembly. If considerable application of heat was necessary to remove solder lock on adjusting screw a new valve spring should be used.

(i) The pistol i completely disassembled except for the hydrostatic chamber assembly, consisting of carrying flange, bellows extension, bellows, hydrostatic piston, stem, and key. Clean all parts thoroughly. Manufacturing specifications now require that all metal parts be coated with rust preventive compound. This practice is also in effect at depots performing reconditioning of pistols. Ke-rosene may be used to clean off this compound. Examine all working parts for wear, corrosion, distortion or other defects. Replace unsatisfactory parts. All parts of the original pistol were made of brass. Due to the need for conservation of this critical material it has been neces-sary to use steel as a substitute where possible. This si-tuation will be reflected in the supply of spare parts. Also, for the purpose of expediting procurement, it has been necessary to allow changes in tolerance and form of parts. However, the requirement of interchangeability has not been impaired.